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Volume 44 Issue 4
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LI Guo-wei, WANG Jia-yi, CHEN Wei, WU Jian-tao, CAO Xue-shan, WU Shao-fu. Influences of wetting-drying cycles on expansive soils improved with disintegrated sandstone with different particle size groups[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(4): 643-651. DOI: 10.11779/CJGE202204006
Citation: LI Guo-wei, WANG Jia-yi, CHEN Wei, WU Jian-tao, CAO Xue-shan, WU Shao-fu. Influences of wetting-drying cycles on expansive soils improved with disintegrated sandstone with different particle size groups[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(4): 643-651. DOI: 10.11779/CJGE202204006
shu

Influences of wetting-drying cycles on expansive soils improved with disintegrated sandstone with different particle size groups

  • 1.

    Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210024, China

  • 2.

    Highway and Railway Research Institute, Hohai University, Nanjing 210024, China

  • 3.

    Geotechnical Research Institute, Hohai University, Nanjing 210024, China

  • 4.

    China Railway 20th Bureau Group Co., Ltd., Xi'an 710016, China

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  • Received Date: January 24, 2021
  • Available Online: September 22, 2022
    Graphical Abstract
    • Abstract
  • Based on the project of diverting water from Yangtze River to Huaihe River, the long-term effect of the improved expansive soils with disintegrated sandstone waste from river excavation is studied. The results show that: (1) The disintegrated sandstone improves the compactness and strength characteristics of the expansive soils. The improved expansive soils have the best compactness when the particle size of the disintegrated sandstone is less than 2 mm. The direct shear index of the physically improved soils is positively correlated with the particle size of the sandstone. The direct shear index of the compositely improved soils is mainly controlled by the improvement of cement, and the influences of particle size of the sandstone is not obvious. (2) The disintegrated sandstone can inhibit the cracking of the improved expansive soils during wetting-drying cycles. When the particle size of the sandstone is larger than 10 mm, there will be crack concentration in the surrounding soils. The crack rate of the compositely improved soils is significantly lower than that of the cement-improved soils, and has no significant correlation with the particle size of the sandstone. (3) The disintegrated sandstone has the effect of delaying the cohesion attenuation of the improved soils in the process of wetting-drying cycles, and the effect is affected by the particle size of the sandstone. The particle size of sandstone shall not be greater than 10 mm in the physically improved soils and 5 mm in the compositely improved soils. (4) The microscopic evolution characteristics of the disintegrated sandstone affect the macroscopic crack development and strength attenuation of the improved soils.
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